I purchased a rebuilt 8.75 clutch type power lock rear end to install on my 68' Barracuda. I knew that I would have to get the drive shaft shortened. I noticed that the pinion has a downward angle. If I put the mounting holes for the u-bolts straight up and down there is about 3/4" difference from center to center when I pull a measurement from the slip yoke. Is this ok and will I need a pinion snubber,and if so how close should it be from the bottom of the car? Thanks